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【简答题】
一个 32位的计算机系统中,虚拟存储系统采用了物理地址扩展的三级分页方式,第一级页表占用地址的最高2位,第二、三级页表依次占用9位地址,最低12位用于页内偏移量,如下图所示。 31 30 29 21 20 12 11 0 一级页表 二级页表 三级页表 页内偏移量 一个进程的地址空间为 4GB,每个页表项占用8个字节,请问: (1) 一个进程最多有多少个页面? (2) 一级、二级以及三级页表各为多大?一共占用多少存储空间? (3) 为提高效率,一级页表和二级页表全部装入内存,三级页表只装入一页,若从 0xC8000000开始顺序映射三级页表、二级页表和一级页表,请计算列出上述三组页表在内存中的地址范围。
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